How to pass generic attrib to geometry shader?

[rapheal]

Hi
I have a user defined attribute vec3 v1, and I’d like to pass it to geometry shader. It doesn’t like built-in attributes gl_Position becomes gl_PositionIn[*] in geometry shader, what does v1 translated in geometry shader?

[Brolingstanz]

In GL2 you need to add the “in” qualifier to your inputs.
varying in vec3 foo;
varying out vec3 bar;

In GL3 you drop the varying and it’s just
in vec3 foo;
out vec3 bar;

[rapheal]

so assuming I have an attrib v1, ａｎｄ ｇｅｏｍｅｔｒｙ ｉｎｐｕｔ ｉｓ Ｐｏｉｎｔｓ ｏｕｔｐｕｔ ｉｓ Ｔｒｉａｎｇｌｅｓ， should I ｗｒｉｔｅ ａｓ
vert:
attribute vec4 v1;
varying out ｖｅｃ４ ｂａｒ；
ｖｏｉｄ ｍａｉｎ （）｛
ｂａｒ ＝ ｖ１；
．．．．
｝
ｇｅｏｍ：
ｖａｒｙｉｎｇ ｉｎ ｖｅｃ４ ｂａｒ［］；
ｖｏｉｄ ｍａｉｎ（）｛
// I assume bar[0] to be v1;
．．．
｝

It seems doesn’t work @.@

[rapheal]

I have solve the problem, it works OK
thank u